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Jo Woong Rae,Kwon Sae Min,Lee Chang-Young,Kim Chang-Hyun,Kim In Soo,Choi Jaehoon,정혜라,Ko Young San 대한말초신경학회 2024 The Nerve Vol.10 No.1
Marjolin’s ulcer is a rare but aggressive form of skin cancer that often presents significant surgical challenges due to the complex anatomy of the pelvis and the necessity for wide excision to avoid recurrence. This case report highlights the innovative use of a 3-dimensional (3D)–printed model for the precise planning and successful execution of a high partial sacrectomy in a 48-year-old male patient with quadriplegia. This patient, who had sustained a cervical spine injury in 1996, developed a sacral pressure sore that progressed into a Marjolin's ulcer. Utilizing high-resolution 3D computed tomography scans, we created a detailed 3D-printed model of the patient's sacrum, which facilitated a thorough understanding of the tumor's anatomy and its spatial relationships with critical structures. This approach significantly aided the surgical team in executing a challenging excision while minimizing risk to the adjacent organs. This case underscores the potential of 3D printing technology to enhance surgical planning and outcomes in complex oncological resections, particularly in anatomically challenging regions.
Woong Rae Jo,Chang Young Lee,Sae Min Kwon,Chang Hyun Kim,Min Yong Kwon,Jae Hyun Kim,Young San Ko 대한신경손상학회 2023 Korean Journal of Neurotrauma Vol.19 No.4
Objective: Odontoid fractures are treated surgically through the anterior or posterior approach. Each surgical approach has its advantages and disadvantages, so the preferred approach remains debatable. There are few meta-analyses or systemic reviews on the mechanical complications of surgical treatment for odontoid fractures. This meta-analysis aimed to compare the operation-related morbidity, including mechanical complications, and mortality of patients with odontoid fractures, treated via the anterior or posterior approach. Methods: A systematic search was performed on PubMed/Medline, Embase, and the Cochrane Library for the studies up to October 2023 on the complication rate of the surgical treatment of odontoid fractures, related to the surgical approach. The risk ratios (RR) with the 95% confidence intervals (CIs) were pooled to assess the mechanical complication rates, other complications, revision surgery, and mortality, depending on the surgical approach. Results: A total of 1,519 studies were retrieved using the search strategy, and 782 patients from 15 articles were included in this meta-analysis. Mechanical complications were significantly more frequent in the anterior surgical group with low heterogeneity. The incidences of fracture nonunion and revision surgery were also higher in the anterior surgery group. However, there was no significant difference in systemic complications and mortality rates between the two groups. Conclusion: The posterior approach was more advantageous than the anterior approach in terms of mechanical complications, fusion rates, and incidence of revision surgery. However, further studies, should be performed to strengthen these results.
A Study on Spin-Lattice Relaxation of Methyl Protons in 2,6-Dichlorotoluene and N-Methyl Phthalimide
Lee, Jo-Woong,Lim, Man-Ho,Rho, Jung-Rae Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.1
Spin-lattice relaxation of methyl protons in 2,6-dichlorotoluene and N-methyl phthalimide, each dissolved in CDCl$_3$, has been studied at 34$^{\circ}$C and the contribution from spin-rotation interaction to the relaxation process has been separated from that due to dipole-dipole interactions among methyl protons. The results show that the spin-rotational contributions to the initial rate of relaxation in 2,6-dichlorotoluene and N-methyl phthalimide amount to 18 and 31%, respectively, of the total relaxation rate at 34$^{\circ}$C. The method of separating the spin-rotational contribution from that of dipolar interactions adopted in this paper is based on the well known fact that in an A$_3$ spin system such as methyl protons in liquid phase dipolar relaxation mechanism gives non-exponential decay of the z-component of total magnetization of protons while the random field fluctuation such as spin-rotational mechanism causes exponential decay.
Hee Kyung Kim,Young Seok Kim,Woong Rae Jo,Chae Eun Seong 위기관리 이론과 실천 2021 Crisisonomy Vol.17 No.7
본 연구는 개인주의-집단주의, 사회지향성-자율지향성, 회복탄력성이 COVID-19 팬데믹에서의 소외 감과 불안, 우울에 미치는 영향을 살펴보았다. 대학생과 성인(20세~74세) 646명을 대상으로 2020년 12월 6일부터 2021년 1월 24일까지 온라인 설문조사를 실시했다. 분석 결과, 회복탄력성은 소외감과 불안, 우울을 예측하는 가장 강력한 변인이었다. 불안군은 28.9%, 우울군은 44.9%, 불안과 우울 공존 군은 25.1%였다. 불안군으로 분류될 가능성은 여성이 남성보다 1.95배 높았고, 사회지향성이 높을수 록 2.10배, 자율지향성이 높을수록 2.04배, 소외감이 심할수록 2.34배, 회복탄력성이 낮을수록 4.00배 높았다. 우울군으로 분류될 가능성은 여성이 남성에 비해 2.40배, 사회지향성이 높을수록 1.99배, 수직적 개인주의 성향이 높을수록 1.41배, 회복탄력성이 낮을수록 4.76배, 소외감이 심할수록 5.01배 높았다. 본 연구의 결과는 COVID-19 팬데믹에서의 불안과 우울을 완화하기 위해서는 소외감을 줄이 고 회복탄력성을 높이는 것이 중요함을 시사한다. This study investigated the effects of individualism-collectivism, sociotropy-autonomy, and resilience on alienation, anxiety, and depression during the COVID-19 pandemic in South Korea. A total of 646 participants (aged 20 - 74) took part in the online survey (December 6, 2020 - January 24, 2021). Resilience was the most powerful predictor of alienation, anxiety, and depression. Anxiety, depression, and comorbid groups were 28.9%, 44.9%, 25.1% respectively. Significant predictors of anxiety were female (OR = 1.95), income (OR = .86), sociotropy (OR = 2.10), autonomy (OR = 2.04), resilience (OR = .25) and alienation (OR = 2.34). Female (OR = 2.40), vertical individualism (OR = 1.41), sociotropy (OR = 1.99), resilience (OR = .21), and alienation (OR = 5.01) were significant predictors of depression. To alleviate anxiety and depression during COVID-19, it is important to reduce alienation and increase resilience.
Lee, Sea-Hoon,Cho, Chun-Rae,Park, Young-Jo,Ko, Jae-Woong,Kim, Hai-Doo,Lin, Hua-Tay,Becher, Paul The Korean Ceramic Society 2013 한국세라믹학회지 Vol.50 No.3
The densification behavior and strength of sintered reaction bonded silicon nitrides (SRBSN) that contain $Lu_2O_3-SiO_2$ additives were improved by the addition of fine Si powder. Dense specimens (relative density: 99.5%) were obtained by gas-pressure sintering (GPS) at $1850^{\circ}C$ through the addition of fine Si. In contrast, the densification of conventional specimens did not complete at $1950^{\circ}C$. The fine Si decreased the onset temperature of shrinkage and increased the shrinkage rate because the additive helped the compaction of green bodies and induced the formation of fine $Si_3N_4$ particles after nitridation and sintering at and above $1600^{\circ}C$. The amount of residual $SiO_2$ within the specimens was not strongly affected by adding fine Si powder because most of the $SiO_2$ layer that had formed on the fine Si particles decomposed during nitridation. The maximum strength and fracture toughness of the specimens were 991 MPa and $8.0MPa{\cdot}m^{1/2}$, respectively.